QmlDesigner: Move MCUs qmlproject template

Change-Id: I513062dac4e47e4bf8b113351ceaf040c1180675
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
Reviewed-by: Qt CI Patch Build Bot <ci_patchbuild_bot@qt.io>

share/qtcreator/qmldesigner/studio_templates/projects/application-mcu/wizard.json

@@ -144,7 +144,7 @@
             "data":
                 [
                 {
-                    "source": "../app_mcu.qmlproject",
+                    "source": "app_mcu.qmlproject.tpl",
                     "target": "%{QmlProjectFileName}",
                     "openAsProject": true
                 },